For some instances I also have imgBurn. This however may conflict with DVD Decrypter or Infrarecorder if not installed properly

Steps:

Firstly, make sure that the DVD is worthy -- meaning readable and functional, void of physical damage that may ruin the show. You cannot copy if you can't play it.

Copy the DVD to an .iso using InfraRecorder. The read speed may have to be tweaked to use below the maximum.

Try mounting the .iso file using DaemonTools and make sure that it plays just like the original. If problems exist, it's time to call on the other tools.

From the mounted .iso or virtual drive, right click and see "Decrypt using DVDDecrypter". Just follow the next steps, find a nice target location and proceed to extract the content. If it is a DVD video disc, it will copy just the .vob files.

Write the .vob files to a DVD using imgBurn. You might want to save DVDs by writing them to another .iso file

If all is well with the decryption, iso and playing the mounted iso, you're ready to burn to a physical DVD or to another media.